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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd565ab585a300a195a480ea03c6310b68b463d8a7e5be5045bcb52db016eb93d' 
  AND token = 'JQiWhvZnXx6HRVjAOodd0zgmWi/K8F5Ny6/zAB8JD5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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