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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8b11d1d5e4f3392a5f69130c6b1b1ccacfd281ce4a127f61a12572b2297719c9' 
  AND token = '5RvykEwkwZw+8pFbj+tM5XEH6APhalK5IZ5eKJySyAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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