Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d010010d813e53733e1118e88f6e9c1c38a5b8d06b0f6ca481303a29aae33b' 
  AND token = 'lrYBBMPDED2Qovpx74KgtJ3Sj9QaFbYkeY8slzXlTHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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