Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdf3df947a12d2efb12686207eaf586af4a2a8ebcf973ec84e89160e8ea8eb2' 
  AND token = '1Uij/BBFxwsbRzDRC6BUvNHbPaakm4+/O4AtUeNHN0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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