Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a15a183ef437f71d29b1be0cc8c3beb2f6a371f9fd2949f73b9092776528ce3' 
  AND token = 'PsPUTHlJX2EZyv/7m8qVT7UOLgSMPfOPHqnoBqtHZJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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