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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '96e1a8b85dc0db922b0df40e5e49fcee26321596bcede4fc56c88cdc45a8de68' 
  AND token = '5ae2SL5gJTZBX4dYnwZr1AX3l5vhHDgZMg4VqrKXUmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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