Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd90ef6c926f9b4d9ed58e930544537a2088d4aca7bf049bc9e4574ef4e9ad1b8' 
  AND token = 'D4uN3B6puZEu3+1TGrRJLrZYXjmDQEJtUf487LtEHMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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