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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '367a770dec0c147c2230d6460e0e93c14c12f88fb9311c46ddaf61757d65cab3' 
  AND token = '6f3WXRt9NM5YP1/dXopx+YU/3+IXenaMvuxyf7oTYi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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