Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '290af0bee115c97af99722e59a56cfb15d9bef4f90d6f4ebbc68578eb70373a5' 
  AND token = 'nZJ4d0P2ubDyeZ+3RWIn1TOZIbHkhRbd1NPjXmAdShM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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