Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a296170b0c06b54f421d1824759b4b6487b18993645c06a108399b2870c50ac5' 
  AND token = '6U6DHbhNWIIf9/SMjhFdx3AocZYWokY5J4FGe/SojSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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