Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2436edb8fa05ff1f3a9b8757321d57b7c470359245e565ff899adcf8fd84fb4' 
  AND token = 'n8chyJGHiJN0DSy3z+U//ugcH5BWZlPr2td9rSwBWy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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