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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d1404729ca9180fb2a34017b77db500cc4c936361cfa5cdbbd816ab33ba495c' 
  AND token = 'BqxMcd3Jsy8RuG9FoIfSA540pgS7yEKgHlolrrYyUbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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