Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5dfedf41498f2c322949c15f43511d3fc4184697850e05cbde8a2de7c266a43' 
  AND token = 'dZF4R7Hq3LpFHG6xd38SDUIK1/YQhbyi+/TeVqSHudQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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