Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6164aad6d7bf30ca125b7ba7015c7f78f953e91fd2ddcabd4d3ec3f8b44c999' 
  AND token = 'Hk+cTshEecF1/vOcKYevt2RDaliOMLqF7H/sw8hI5qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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