Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6dbce65fef65d17dc2b2e2374d30e771caef4ace6e47a73c8416256dca3fdac' 
  AND token = 'o0+Op9L+Xh+U8l8rtTr+OyQR9SUVqfly0bt2Ej7cYt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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