Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75ae4fb3a06661ab44f05670ff78b0d635795d6777b2ffe3d6be9c60fbd544d' 
  AND token = 'VMd93B3slB67PGUSATpBLV8DhgoW/2OTtgjBMdQ8Fq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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