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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f8141f8cac981453b42c6a8c4feefb887de4bd84192d625201c3956c1cc400fe' 
  AND token = 'Pm+EP0WO4i6bfr7cu5wyEgXOluIjjX5qQ6u5+6cjgb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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