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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8ea8e3b51ab6e4d69225d8fc6ca2ba6d7548372b577cf979694a8ec71eaca0ec' 
  AND token = 'DcQdSAgpMWPNua8nR+iHskJs2ONk2Ky0mSAz+7ZZo/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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