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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '32f22247db86d1a601d430224746e9ecce9b48c6495bb32c1188155d2dbd99aa' 
  AND token = 'qQSuskglsa9mrWlY6FFqDTHujray9IyPxVmslGKwCXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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