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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b4f4b4ca839ab876d103983b87e92f45e41ae633fe127a3c1365202ea1a561a2' 
  AND token = 'WTscDvmX8xTDNOE7OOAmLwCYkc5xAbcGRgd8KM7MXUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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