Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cca65995869d4bcc73857c993b71787a6fbaa27de17a85da7fa3152e161c06' 
  AND token = '17ru1Nynlg3NO+VJ5XbCYjWoalIBcE+Rn+t4NzMwrEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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