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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e1e55bb50809615667931fbd60ade8c4f50b69087bfd7e7ab84756cac7e7138' 
  AND token = '7W4rpSt//IFFtTPULVqA0hmtq33pNAQogu9fcwB4kpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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