Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762b5499162f6d3503b87f8dac76beefb186dfb519354c56fbce90ef74fb9a2a' 
  AND token = 'xmbotnAENS4rBdve3YEVHlWd7AYbzuOK78gQBAFsudM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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