Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336e5751ae49b3e42be51025246b5c4973cdafb3df17b821fd6b0018b2bd4fe0' 
  AND token = '0yNZ6NmLaFeExUtLN5CQ5wCCuvbhypgnpZeK4Up4dgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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