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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e3f2daa4369e4ddee93877d98cb1bfbe200197dd65995df871b346f98523bbaa' 
  AND token = 'QMmdllvnypomOLnDA8g4bnlJ8PK84g1MQoX6lyIunTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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