Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473d82b2e8a87298d1b74834eeb03e880f734990f577aa45c23242cee6a1921b' 
  AND token = 'l8hRHBoXqPrzOdZC0i83GSHQnVlIR6toF6lw2PjgkB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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