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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d0adbad5bfc3da700a5603e6d5eef3336ddea5fa3150933761b7ba371af37ff' 
  AND token = 'vFfCyKnMq6MbQ9z3txufKE8L4lzAbcGgWYG53rm5IT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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