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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '05672564e01e2f0ec496f8de37fbcd42e400c10ae86d1ccedf2347a451f5b67e' 
  AND token = 'bDV4OCPgyrNdoF30cLYdX9PD/Vli7uyg68yYI8+aXrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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