Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b831b612bca2d9addcbb14f58c85aef1491620f1f7a43ad970288ba966f8d38e' 
  AND token = 'eQlPDpY4P5C94MSB1HVQqJUf3FjOdBPyA58AzLnkOpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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