Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7003de04c4a7a558567ad2df8569d31c5730f24ede2e1c8a907b6b19efdef8' 
  AND token = 'ZpEJCdsgS7KZq/b+FzeNSuAn/mal4pIdoO8/RYqjsaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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