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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '04876f4c7e828225987fb62a3bb1858581c5e670a5e476790e5f601937cccf76' 
  AND token = 'nrbNoAPDMoHdfi8/WnO2Gql2b5Qr2/gzzZzYNqNXcT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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