Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40da7880d9e1a58df3051660d0336fc2f4387177c330a96296f5f2c77b955ee' 
  AND token = 'O7oVcD38qkJZCAQV1MvCUJ6oLRlXj/cdjwXSt2r7UOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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