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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '114c88f26b285d1d5ef1eeaa0eec442a328b26a9df637c836657d7a3007d4da9' 
  AND token = 'IaeFJujueyYMcXx74P+GfWFg6dztW43O3paVmE5Ur3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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