Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2725e7a7e458c1b39ca8bfc00b27035de0bf09aedf3acc3a905acde397b85ef' 
  AND token = 'MISm6ji63iq3Gq1Z18sQ0Z8mfUrPjHVjoWlJUMg2qvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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