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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6cefa379e9234d3a80b2412a465e1a56a7a96b2168754d3eaf71e2ec7dc2ed07' 
  AND token = 'llSrwfYZKKMhqvXRs1J0bU9KqYXENyz+TCkaaAdnxKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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