Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c6cf75557563485bb6f5842e02afbbc26d6ac09ecc63a49e2651f77ba14f04' 
  AND token = 'o23vROL2/f5lJFVtrt0b2QRvJAi93jVDKr1CWcuCt3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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