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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aafb4785af94667943f1c78215ea26dcdff57381dd9b65d2430be14f860eda2e' 
  AND token = 'L94MaVeB8pe+IvNnZ0G3ZF8OJDC5A54E875TYl+SfqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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