Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215cd16535caa61b643fcd6c7236745aaa79034832b74a2051bb7b9b8a5aabe9' 
  AND token = 'kIGAH4hrwx0mMyxaaxiBVE5Y2Vn1dvHgz1XuO9EQ/Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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