Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2b04d8a05ece903c0afd3b79b7aceb46e3ad674a1ad58551699b6b22ad9d75' 
  AND token = 'Jz1LBDaUB5PvfKOBb3pL//gQ7Eo21RdOURVtwpiyI7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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