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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '29cfa9458aa032ac2e09e09bce5c6b93c8f54fdc2b5b62800556b9ecd8d36ab3' 
  AND token = '7tfkscWdMWSxZFE+Kks0Wmn8EaDi303CNDANArf7JRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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