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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '11ce57b23e13d1dc0e793e7c190ed6e0d38670d42aa7c248ce8f5aff36d2a37d' 
  AND token = 'tsF7K+aAnKVR28YvlQz/M8v+C3NdIw8oqKkJ+Bedd9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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