Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768e39ef1ad11c43d79eca3fa0d3f00ab33c1c96335bc61b1c77d65468abbd25' 
  AND token = 'ekQO7OyYnZGM/2OYMtGHjIrXpg2MM3WVCj3MKMFrqT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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