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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '915495729f98847031811d59db931db6a9f33e8a9121c75157cb3b4e13c73905' 
  AND token = 'ntuKV9T3FEu/wrWGcOdhnfYwpMn70V9wJ4deY79VgOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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