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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c42c038902a8933a27a563e4e771f57940d193a19b35990675a1dfca8b5a5f8f' 
  AND token = 'hxsodSQVbilGr4rK6E4HN3f9OYhm8fKnNjP9ycbps4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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