Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d7651f22346d0e3e55a62e6e1e2da08d31a48bf5530b75e4ca3d94a431708a' 
  AND token = 'Mz8F4nSD+rjqUReHlZq+g1Ti02tXWXFHJjw4HNj8mGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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