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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3ed8e522143ed5367050e0e8e19e8ffe06d184d45b9e00445e2e4f39d0abcbdc' 
  AND token = 'P9a/SEFMvxkM/O4HxTuJv6z0F47UMKVgQJtvOtEDKt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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