Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a7a27cb75963f89fffd5dc3fd1f5d2bacdfac0662c2afa6be6292ed8059991' 
  AND token = 'GmXTyn0+vgffLrxxozjsvx7SbOlKZv8dbcUay2ZMUrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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