Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f26d89b41b74a3009c606bb4ffac830e3cecf236079edfeab9ee1c83c78dec' 
  AND token = 'eC4P2nwvJ6Q9EYSnbd2Mk16eBjJiYikIOyavTVrfH18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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