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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '14c6fc2b86c6f81aac23440a037e63f53f7a7a787e316ca0bc439519f8675441' 
  AND token = 'p7ZKWK8jO5ds1vKxsoERClyXfkupymm3XpwiHA12Cpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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