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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2cd333a2297cacf249fa90380de42f3a74cef29374323a165700feb6694fe890' 
  AND token = 'VmNPKzBEt9Szl4NDMo85pISoUwKPlECkhYSa+uH1IAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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