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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1542ea34235b8e9170ce90c30a70e0216ce1072f8bb7059560b0f9cfbdb73a87' 
  AND token = 'CmVRN4xazaPC2co+i5DPUuFQY/9i036nFVDumA2YhOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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