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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'db7fb0dc064b9f7453ce6df9fdd735bdbf6c4ab6debd3e8946d74b063d67a1a0' 
  AND token = 'gk8E27SPKiQKkhjDhvXX3o6r/iES5wU/xwWEg3IVnVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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