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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e230d5d6a517c57d2657844dd42af7b00d9b4dde4794ed77aafbca2e1f84a37' 
  AND token = '5l58/ByV/u9H3cydiZZWJk9yt2e76rmvY8sHFbA8TYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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