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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4b613e19d7a67bc7e4022275e629f81a723b12687fab209001e0389d7b0154db' 
  AND token = 'nnqoExbK8G5pOpho6kVYSRvbqTZduoOtF6Y3Q7w0HVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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