Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8e09a5a495825a56b1f5d6ee1e3ee0c9d83bcbcc0deb82d1f9c8e376308f8e' 
  AND token = '7Xzcej+5C+qnx7mD9sBm8qsjzAMpyTasqQ4nvgXLvLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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