Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631948c78e433687279c85d8f0600f95939ecc2c73b85840d6a6e0c3622bf35c' 
  AND token = 'us8DM1buJBTuaBFMx5//aDykg4to1LKD8DiKtBMN2zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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