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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd51538dd213d91415bc743213148d24e9cc1ca89c60394bad2cac54d08654228' 
  AND token = 'O9fpvtf9jZEsRDaBPUvAodl7oP5TZT8anssm9ClWCKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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