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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '85da0e936b8b240cd2bef26aa4cb91cac110252e1890f6afd3430bc6692da684' 
  AND token = 'sI8hytCUWwp8j01+rOZipljQa4m1fQ/wmZPmeKnkiyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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