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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '15363b91f0a721fe484ca9ebd9cefba0ab0825a4492493fd57c8ea8dd077117c' 
  AND token = 'NrxuuaC4d4SqZdN3Pu3wBL+pl/IE2d6HIZISMApbFfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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