Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd0d5e632452196ec1136ce48cabff185acafc2e984c9812ef96c5cc072f65edc' 
  AND token = 'VgFZR2l9/wqa8MyJA6Yq81WMVVNN4UMJGZFEoBJhZZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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