Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ef389b4477596767deb37b9fcbb5044010e6d3be7f4337c8f9458dbb1cf994e' 
  AND token = 'H/aeOB9PcvLFsLqsHJ6JG5K6d9rEaKQHS16aiGisgjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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