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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2232d26684df737c31634c7e33060f6e2d30f50f43ba74c00667cdeeeb2f63d5' 
  AND token = 'RlRA3uBlcp048/wBGELmNPAY4uQsJmrw1vHyC6p5ktU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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