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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34ddda773b6b557c967ff23b41ffa871439ede09189b54456c6837be547c975b' 
  AND token = 'Fm3uVSruFRGvd4K9Y71E7remUHfTlArx6OnS19CLrcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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