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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1a356b60f856df1708c0a655dd9ff081c15833dff5e7763236a76e7b62704bd4' 
  AND token = 'PzSbk6RGLdowX8WwI2AkuDur5c5wBqQUhNBJYbldgaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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