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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '95ef175576e506ee1a8ea40cc51846b183d04ce458e67cf38a7d2194a300e3a7' 
  AND token = 'tVIhfjgyGVmpMHr3wyxx0UVyv4cIuleKYHoy5SMyslA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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