SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0361b5fe5898847b17964f1489fdd229ed86fa3bcde16ebabed198fbf99470d6' 
  AND token = 'zG0B9r0VqiGbyihYv+s4jl6HChJXLCcK7IeGoQoUbYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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