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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5aab7bacc66e86dd86f23d4120c576f90d4a3f2d3d03be2d4bd84a13408a01cc' 
  AND token = '7wvb+XeQ/sDUYLA/6H+LwUyJhkdq1C8585dTHXlbA0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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