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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '47654b2fb74a6842d2d0f1a6c8c8d7900d8dbb46ec25dabf446888e38deebc89' 
  AND token = 'SBZfhMoXKEARv9t8Z/K8vafiVDdttcg+nyXF5p9ATeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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