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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c7d33c37dc4894ebeef69a23af00721bc7290ba7db73f5bbc18b88fd3c3f420' 
  AND token = '3REnQe9tKVHi00/2KAAayL1N5FYAmcfo2Qnowmh0sh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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