Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d6a48ac6a2f79d611f97df96a23f1fdaf94b070fec724a00aec82223b3a62f' 
  AND token = 'UDrHsT7rFwZtdc2U7tCVoTE3xmOgSBAGm0qcjPzl0R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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