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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fdd3d570a7f94bfeaa4ac66b416efcd9d590307e0d491d08cb2209ae1a887186' 
  AND token = 'ftxGIds5m9B1AyPH5HiP/sGA57J6aDzaSP9HbszxmP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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