Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72c2e62c4f1f66d52cb0ec2e06ec39387b2868dcec39ab78ae9eb1dd123aa5a3' 
  AND token = 'cCHA6RPaIi4l0o0CdCm1e0H8VyhENRE+1HyqhKkbhfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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