Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb713b7027a0dfbcc59d5cf504bcb1efac14a732a3073acafbef805c6d8dd49' 
  AND token = 'Hc3v5Jm5FfWzgCaCRnc6QuWLJ7BZGOOGo6LuvWl6VkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}