Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b4d1b4ed6e050a16da7afea2dae371866d1893ece358d8fc37f895b10b17fb' 
  AND token = 'F0XwDmWEe0QiZAtPbykot36hgDPuuZ46impbz/Itf3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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