Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4bfd0aff3cf44a747a6cdb6577c2cabdbd098dc7f6a5914c99e20a9317814d1' 
  AND token = 'sm6dS15F2SSbXTL4uLgWAuANrmtz5OfRfiYqcPoBf9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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