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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f946c8d9ac1b31618d5b4af35a82ca569e9aba424706a53e506f83b3a38f110b' 
  AND token = '0Kgp7jMYk7neXyU5HnJKKk7UaymPnQ3jhWvHgW8x6LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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